California Code, Penal Code - PEN § 11478

(a) Good faith reliance by a service provider on a court order issued pursuant to Section 11473, a signed statement of intent prepared pursuant to Section 11475, or the instruction of a supervising law enforcement officer acting pursuant to paragraph (3) of subdivision (b) of Section 11471 shall constitute a complete defense for the service provider against any action brought as a result of the interruption of a communication service authorized by that court order, statement of intent, or instruction.

(b) A communications service provider shall designate a security employee and an alternate security employee, to provide all required assistance to law enforcement officials to carry out the purposes of this article.

(c) A service provider that intentionally interrupts communication service pursuant to this article shall comply with any rule or notification requirement of the Public Utilities Commission or Federal Communications Commission, or both, and any other applicable provision or requirement of state or federal law.